The utility model discloses a worm gear support structure of an automotive electric power steering gear. The worm gear support structure comprises steering gear output shafts, a locknut, bearings, a worm gear and a shell, a left and a right bearings are respectively disposed on the steering gear output shafts located on two sides of the worm gear, a groove matching with a circlip is arranged on a hole wall of a bearing hole located at the left end of the shell, a left end surface of the circlip is in contact with a right end surface of an outer ring of the left bearing, and the right bearing is installed in a hole of a support plate located in a hole on the right end of the shell. The worm gear support structure of the automotive electric power steering gear has the advantages of uniform force, small deformation and small footprint.